I have always been against dividing tanks, but I made an impulse buy... so yeah. Ima divide a 20 gal, but I don't want it to be permanent. because I might get a third later. I haven't actually made the purchase yet, so the betta is still at the breeder's place, but I will get it. I already planned it out. Also, will hard water make a hm's fins curl like the vt's? Its my snail tank.

As for curling.. it may make it a little curly on the ends, but not like a VT's.. the dorsal for an HM should be wide/broad, unlike a VT's which is more pointy. I haven't personally seen an HM yet with the same type of curls, or really curly for that matter.